What are the disadvantage of a circuit breaker or a fuse in a circuit?

Answer 1

The only ones that could affect that decision to put one in is if you're planning on smoking or blowing-up that item in the circuit, or the hassle of changing a 20 cent - 5 dollar item instead of the more expensive item.

Answer 2

The question is not right. The fuse and circuit breakers are two different protective devices used in the system. It is unlikely that the system has both fuse and a circuit breaker. Fuse is a piece of wire of suitable rating that burns off safely when the current goes above the rated capacity of the fuse wire. Once it is fused (burnt) it cuts off the current flow. It needs to be replaced to restore the current flow. The circuit breaker is a more advanced protective device. It is capable of isolating the circuit automatically if connected to a relay, say over current relay. The over current relay senses the over current in the circuit and triggers the breaker to trip off safely to isolate the circuit. No destruction happens to circuit breaker. It can be switched back once the fault is cleared. Like over current relay there are many such relays - earth fault relay, over voltage relay etc for example.

Answer 3

You can reuse a circuit breaker , it generally activates faster in fault conditions than a fuse .